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First Measurement of the Neutron-Emission Probability with a Surrogate Reaction in Inverse Kinematics at a Heavy-Ion Storage Ring

Journal Article · · Physical Review Letters
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  1. Université de Bordeaux, Gradignan (France); Centre National de la Recherche Scientifique (CNRS) (France); IJC Lab., Orsay (France); et al.
  2. Université de Bordeaux
  3. Max-Planck-Institut für Kernphysik
  4. GSI Helmholtzzentrum für Schwerionenforschung
  5. Université Paris-Saclay
  6. Goethe University of Frankfurt
  7. TRIUMF; University of Victoria
  8. IFIC
  9. CEA, DAM; Université Paris-Saclay
  10. Max-Planck-Institut für Kernphysik; Ruprecht-Karls-Universität Heidelberg
  11. TRIUMF
  12. Chalmers University of Technology
  13. TRIUMF; University of British Columbia
  14. GANIL
  15. Goethe University of Frankfurt; Los Alamos National Laboratory
  16. GSI Helmholtzzentrum für Schwerionenforschung; Aachen University of Applied Sciences
  17. University of Edinburgh; GSI Helmholtzzentrum für Schwerionenforschung; Max-Planck-Institut für Kernphysik
  18. GSI Helmholtzzentrum für Schwerionenforschung; Helmholtz Institute Jena; Friedrich-Schiller-Universität Jena
  19. IRFU; Université Paris-Saclay
+ Show Author Affiliations

Neutron-induced reaction cross sections of short-lived nuclei are imperative to understand the origin of heavy elements in stellar nucleosynthesis and for societal applications, but their measurement is extremely complicated due to the radioactivity of the targets involved. One way of overcoming this issue is to combine surrogate reactions with the unique possibilities offered by heavy-ion storage rings. In this work, we describe the first surrogate-reaction experiment in inverse kinematics, which we successfully conducted at the Experimental Storage Ring (ESR) of the GSI/FAIR facility, using the 208Pb⁢(p,p') reaction as a surrogate for neutron capture on 207Pb. Thanks to the outstanding detection efficiencies possible at the ESR, we were able to measure for the first time the neutron-emission probability as a function of the excitation energy of 208Pb. We have used this probability to select different descriptions of the γ-ray strength function and nuclear level density, and provide reliable results for the neutron-induced radiative capture cross section of 207Pb at energies for which no experimental data exist.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
89233218CNA000001
OSTI ID:
2523978
Report Number(s):
LA-UR--24-20011
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 7 Vol. 134; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS